Trunk-piston closure.



No. 876,686. PATENTED JAN. 14, 1906.

W. T. HARDER. TRUNK PISTON CLOSURE. APPLICATION FILED MAY 11.1907.

wventoz vitmcooe a I WILLIAM T. HARDER, OF NEW BEDFORD, MASSACHUSETTS.

TRUNK-PISTON CLOSURE.

Specification of Letters Patent.

rammed Jan. 14, 1908.

Applicatipn filed May 11 1907- Serial No. 373.098.

To all whom it may concern:

Be it known that 1, WILLIAM T. IIARDER, a citizen of the United States, residing at New Bedford, in the county-of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Trunk-Piston Closures, of which the following is a specification.

My invention relates to trunk piston closures, for internal combustion engines, applicable more particularly to pistons adapted for use in what have been termed crank case compression engines.

The object of my invention is the construction of a piston having the ordinary characteristics as to its general features, its hollow interior being closed by a device of special construction and particular arrangement with respect to the said piston, whereby it is thought that less of the internal chamber of the piston is added to the internal space of the crank case than in any such' engine constructions with which I am acquainted. By the use of my invention the internal space of the crank case compression chamber is re duced materially, with increased initial compression and augmented ultimate power of the engine resulting. The stated object I accomplish by fashioning and associating parts as illustrated in the accompanying drawings, of which Figure 1 represents a vertical section of oneform of crank case compression engine eiulpped with my invention, and Fig. 2 is a 11 e section of another form of such engines alsoprovided with my invention. Fig. 3zis a vertical section of the piston detached, the section being taken upon aplane transversely of the wrist pin, and Fig. 4 is a like vertical section taken on a plane in which lies the axis of the wrist pin. Fig. 5 is a perspective outline view of the piston closure detached. Fig. 6 1s a fragmentary sectional view on line ac':r: of Fig. 4 looking upwardly. The scale of drawing in Figs. 3, 4, 5 and 6 is increased to render details clearer.

Like letters of referenceare used to designate the same parts throughout'the description and drawin s.

The engine cyhnder is marked A, the crank case B, the body of thepiston C, the engine shaft D, the crank E, and the pitman or connection rod is referred to b the letter F, all of customary structure an operation.

The piston closure forming part of my invention comprises the device substantially as illustrated in Fig. 5, having a disk baseG the periphery of which is finished and fits'tightly at the lower edge of the interior ol the body of the piston against an annular surface also finished to eflect a practically steam tight joint. Formed integrally with the disk base -G is the upwardly-extending rectangular housing H, usually braced at the sides by the webs h, and having extensions J of its remaining sides, those extensions forming wedge-shaped chambers as best shown in Figs. 1 and 3, into-which the pitman swings alternately during the operation. The orifices K in the sides of the housing near its top are for the passage of the wrist pin L.

In assembling the parts, the housing H is passed into the hollow of the piston C, and

ts closely between the sockets M and N which project within the piston and receive and hold the ends of the wrist pin, which is ordinarily passed tightly through the sockets M and N and orifices K of the housing and movably through the head 0 of the itman within thehousing as shown. It is elieved to be clear that after the closure has been thus assembled with the pitman head and wrist pin, and is placed within the cylinder of the engine, the closure cannot become displaced. It is, in fact, locked in osition vb the passage of the wrist pin. t is also t ought to be made apparent that the interior of the trunk iston is shut off from the crank case cham er as far as it is practicable to do it, thereby materially reucing the compression chamber in size below What it would ordinarily be with the piston open. I

Havin now described my invention and explaine the mode of its operation, what I claim is 1. In a trunk piston closure, the combination with a piston, of a closure comprising a base having a housing thereon, the said housing being closed at the top and open at the bottom and having downwardly and outwardly inclined portions to permit the swing of the pitman rod, and means constructed and arranged to secure the said closure within the piston.

2. In a trunk piston closure, the combinaton and housing having apertures constructed to receive the said wrist pin whereby the closure is secured Within the piston.

3 In a trunk piston closure, the combination with a piston, of a closure comprising a base having a housing thereon, the said housing being closed at the top and open at the bottom, a wrist pin, the said piston and housing having apertures constructed to receive the said wrist pin whereby the closure is secured within the piston.

4. In a trunk piston closure, the combination with a wrist pin, of a piston having internal projectin portions rovided with passages adapted to receive t e wrist pin, a piston closure comprising a base having a rousing thereon, the upper part of said housing being arranged between the said projecting portions of the piston and having apertures for the passage of the said Wrist pin whereby the closure is secured to the said piston. y

5. A hollow trunk piston having its lower end closed by a plate or base having a housing thereon, the said housing being closed at the top and open at the bottom and having outwardly and downwardly inclined 'por tions to permit the swing of the pitman rod, the said piston and housing having apertures constructed to receivea wrist pin. In testimony whereof Ihaflixmy signature in presence of two witnesses.

WILLIAM T. HARDER. Witnesses: DANL. T. DE'voLL,

ANNIE J. HAYES. 

